Weft-thread cutter for automatic looms



J. DEMAINE WEFT THREAD CUTTER FOR AUTOMATIC LOOMS Filed Jan. 15, 192 I 5 Sheets-sheet 1 I/ff INVENTOR. ea/ 6m a/Jhe.

A TTORNEYS.

J. DEMAINE WEFT THREAD CUTTER FOR AUTOMATIC LOOMS Filed Jan. l5. 1925 5 Sheets-Sheet 2.

IN VEN TOR.

ATTORNEYS.

Jan, 24, 1928. 1,657,201

J. DEMAINE WEFT THREAD vCUTTER FOR AUTOMATIC LOOMS Filed Jan, l5. 1926 3Sheets-Sheet 3 l /7 l0 A9 /7 INVENTOR.

9 JZZ/f 7e/7707276. 9% w #L wwwdm f /5- ATTORNEYS. v v 1.9% a ./9

Patented Jan. 24, i928.

lltll'lll) STATES JOHN DEMAINE, F GREYSTONE, RHODE ISLAND.

WEF'leTI-IREAID CUTTER FOR AUTOMATC LGOMS,

'Application filed January 15, 1926.

This invention relates to thread-severing mechanism for automatic looms; and has for .its object to provide in such a loom a cutter to be operated by action of the loom for severing the trailing thread of the spent bobbin each time a change of the bobbinis effected.

A further object of the invention is to mount a cutter on the replenishing side of the loom and 'to provide means whereby the replenishing mechanism will move the cutter to open position and the action of the lay will close the cutter to sever the thread.

A. still further object of the invention is to provide means in the cutter for clamping and holding the severed end of the thread leading from the selvageto prevent this thread from being carried baclr into the weft by further action of the shuttle.

With these and other objects in view, the invention consists of certain novel features of construction, as will rbe more fully described, and particularly pointed out in the appended claims.

In the accompanying drawings: c n

Figure l is a top view illustrating the position of the cutter at the replenishing end of the loom and as mounted on the breast beam.

Figure 2 is a di'agran'imatic view illustrating a portion of the weft replenishing mechanism controlled in its action by the feeler mechanism to effect the opening of the eutter previous to transferring the bobbin from the shuttle.

Figure 3 is a side elevation partly in section illustrating my improved cutter with the movable blade closed by a forward movement of the lay.

Figure l is a top edge view of the cutter.

Figure 5 is a side elevation illustrating the movable cutter blade in open position and the presser linger as extended into posi tion to be engagedby the last end of the forward movement of the lay.

Figure 6 is a front edge view of the cutter blades in section illustrating the clamping action of the movable blade on the thread during the closing movement thereof.

Figure 7 is a perspective view showing the outer end of the cutter supporting arm with its extremity bent at a right angle thereto and provided with a guide opening.

Figure 8 is a perspective view showing a portion of the fixed cutter blade removed.

Serial No. 81,405.

u Figure 9 is a sectional view of the under side of the arm supporting bon sectioned on line 9-9 of Figure l0, showing a portion vof the arm and the spring therein.

Figure l0 is a sectional elevation online "SO 10mi() of FigureQ. Y

It is found in the practical operation of automatic looms particularly the drop box 'type for weaving different colorsyof advan- 'tage to provide cutter which is located close to the selvage so as to cut the spent weft just previously to the transfer of the bobbin and to so shape the cutter device as to clamp and hold the severed thread between the shuttle bei; and the selvage to prevent the end from being drawn baci; into ther cloth by further action of the shuttle, the cutters being so shaped that they will discharge the thread held between them upon the next opening action ofthe i'novable blade. Furthenit is 'li found of advantage to positively open the movable blade of the cutter by actionof the replenishing mechanism and tol positively nove the bladeto closed positionby action of the lay as it approaches the last end of its forward stroke; and the following is a detailed description of the present embodiment of my invention and showing one construction and arrangement of weftsevering mechanism by which these advantageous re'- sults may be accomplished: i V

lith reference to the drawings9 l0 designates the breast beam of a loom on which my improved weft severingvmechanism 'll is operatively mounted. This mechanism comnu prises essentiallya relatively longsupport ing arm l2, the forward end of which is mounted to slide endwise in the openings i3 and it of the boxshaped bearing member l5. l'lhis bearingfbox is preferably formed with slots 16 through which fastening bolts li' are passed so that can be adjusted forward and back to nicely regulate the positions of the cutter relative to the action` of, the lay 1S. This boi; is providedwith a webv 19 which extends a portion of vits length leaving a space f3() at one end thereof whereby the spring abutment pin Il may be passed through a hole in the arm against which one end 22 of the springrests, the opposite end Z3 of the spring eng ging the outer end or will of the bonv whereby the cutting mechanism is yieldingly supported in operating position so that if a shuttle should stop on the lay ydirectly in 'front of the cutter the 110 Y reception oi whole critter mechanism would yic be pressed `forwardly by the lay without a smash occurring.

@n the tree end 24 ot this arm, l have termed a laterally-extending end portion slotted as at 26 for the purpose, presently described. Mounted on the pivot pin 2? on this arm is the movable cutter blade 2&3, the same having a cooperating shearingv edge 2S and this blade is provi A ed with an upwardlyextending shoulder portion 30 which has termed therein a circular recess 3l tor the "i the head 32 oi the presser linger 33, the liree end this finger being O'uided through this slot 26A in the oiiset portion 25 of the arm l2 und this movable blade is `provided with a forwardly-projecting operating handle 34.

Cooperating with this move the hired blade 35 which is provided with a hole 36 through which the pivot lin 2i also passes, a nut 62 thereon serving to bind this blade in set position. rlhis blade is provided with a shearing edge w1 ich cooperates with the edge 29 ot `the movable blade to shear the thread and this lined blade is also provided with a rearwardly-entending bearing portion 38 which also extends into the opening 26 in the otset 25 ot the arin l2. In order to vadjust the shearing action or this fixed blade to properly cooperate with the movable blad-c, l have provided an adjusting screw 39 which is threaded through the arm l2 with its inner end resting against the inner surface of this blade 35st its lower edge 40, see Figure 3, whereby the inward adjusting oit this screw 39 serves to tip the blade on itspivot pin 27 to cause a'close'r shearing action of the cooperating 'shearing edges 29 and 37. Y

During a regular rweaving action oi the loom the movable blade is held in closed position and in order to open this blade at the proper time, l have connected its operating handle 34, Vas shown diagraniniatically in Figure 2, to the arm 4l oit the wett replenishing mechanism by the connectingv rod 42 and the extension lever arm 43, whereby when the usual ieeler mechanism 44 -linds an `exhausted bobbin in the shuttle 45, the' abutment pin 46 is caused to remain beneath the lever 47, whereby upon the nextdown-` ward movement ot this lever, through action olcam 48 and connecting rod 49, this .lever` eng-ages 'this abutment 46 and throughith connector 50 tips the 'tree end oi" lever l, Whlch 1S DlVOted on shaft 52, upwardly thusv `Figure 2, which swinging movement opens ine lav now comes on its beating-up il. c,-

., vhe, the upwardly-entending' portion reef L 'b pre ier arm 33 oit 'the cutter, which 'is at 'that in position illustrated in Figure' "5,4

driving the saine -baclr and causing the thread Sid-to be vhrst clamped between the movable cf blade2i?) and the inner surtt'acc of thee` pportiiigfurm l2, asbest illustr il ir Figure 5, 'the thread being` finally li v\ bla vJe ceopeL h die Jui f edge 37 ot the theel blade. lhe movable bladethen remains closed thusret'aining the end or' the se d thread until vthe critter opening' ation above described is repeated.`

, Y .ii be notedthet tl'iecutter carrying arm 'l2 is provided with an abutment end portion `or shoulder4 against which the thread 56 may engage in being dra-wn into the cuttervr which abutment 'serves vto `limit the distance the thread shall `be drawnlinto the cutter. this construction the thread is n rom jannning, clogging, or

chol; ig the cutter the further thethrea d is vgripped from the pivot `point 'the more eiiectually it is acted upon by the opening action oi the cutter blade to withdraw the thread trein its clamped position and so the cutter, 'whichc'le'aringaction isinot attested where the thread is drawn in close to t Le 'pivoting point.

My improved wett thread supporting deis extremely simple and practical in construction, is'lpositive in its operation and both its opening and 'closing-actionsare positively eected by action of the loom.;- also by ythe construction 'ot' my improvedr cutter the weit thread is securely clamped bythe cutter blade and is retained in that clamped posit-ion unt-il `this cutter blade is again opened at which time 'this thread is released and will by the openinl movement o't the blade drop out and free the critter.

rihc foregoing description is directed solely towards the Iconstruct-ion illustrated, but l desire it to be understood that I re` serve the privilege oi resorting; to all the mechanical changes to vv'hich the device isv susceptible, the invention being defined and limitedenly by the terms or" the appended claims.

l claim: i l. ln a wett thread replenishing loom having in combina-tion, a lay, a weft replen- 'faees this "forwardly extending ishing mechanism, a Wett thread cutter device comprising an upper iixed cutter plate, a clamp plate spaced from the cutter plate, a cooperating movable lower blade mounted between said plates, and an endwise elidable presser linger pivotally connected to said lower blade at a point between said plates and retained in attachment with said cutter by said plates, the l'ree end ot said linger extending into the path oi movement of the lay to be engaged thereby to operate said blade and sever the threadq Q. ln a Weit replenishing loom having in combination a lay, a. Wett replenishing mechanism, a cutter supporting arin mounted on the loom traine, a tired cutter plate, a thread clamp plate spaced Yl'rom the cutter plate, a cutter having a inovable blade pivoted to said arm between said plates, an endWise slidable cutter closure member' guided in said arm and pivotally connected to said movable blade to extend into the path oi movement oit the lay to bc engaged by its :t'orivard swinging to close said blade and :a sever the thread, the pivoted end of said closure member being retained in attached position to said movable cutter by the iiXed cutter on one side and the clamp plate on the other side.

3. ln a weft replenishing loom having in ceinbination, allay, a Wett replenishing mechanism, a cutter device having one fixed out ter plate, a thread clamp plate spaced from the cutter plate, a cutter blade pivoted between said plates with its ehearing edge eX tending rearwardly from the pivot and a shoulder portion extending upwardly from the pivot between said plates, a closure member slidably guided in said arm and pivotally connected by a ball and socket joint t0 the shoulder portion ot said movable blade between said spaced plates and arranged to extend into the path of movement of the lay to be engaged by its forward swing to close said blade and first bind the thread ybetween it and said arm and subsequently sever the thread ,ln testimony whereof I a'HX my signature.

JOHN DEMAINE. 

